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A Budget Amp Comparison


Budget Amp Comparison – Crown, Nuprime, Parasound


Everyone who begins their journey to audio nirvana probably begins the same way; with a bunch of research and wondering if they have spent “wisely”.

For those just starting out or just looking to make a change, this is a comparison of three budget amplifiers.  All three seem to have found a pretty good market following which probably means their price/sound performance is acceptable. Hopefully this comparison/thread will be helpful to new people entering the hobby…and hopefully this thread will invite comments from others who might have additional ideas about starter amps around/below $1000.

The three amplifiers are:

Crown XLS 2000/2 Class D ProAudio Amp - $499 new

Nuprime STA9 Class D Home Audio Amp with a Class A input stage - $649 new

Parasound Halo A23  high bias Class A/B Home Audio Amp - $995 new

(The most obvious amp missing from the group is the Schiit Vidar at $700 which also has a pretty good reputation and deserves consideration)

The other equipment these amps were paired up with during the comparisons include an Oppo 103, Parasound 2100 preamp, Tekton Lore loudspeakers, Blue Jeans RCA Cables and homemade OFC stranded, twisted, shielded speaker cables.


Crown XLS 2000/2002

The entry end for a new amplifier is probably $4-500 and the Crown is a pretty interesting amplifier at this price level. Designed by Harman International for pro audio applications but with consumer audio connections included as well (RCA inputs & banana/spade/bare wire speaker connections). This is a class D amplifier which Harman engineered to be powerful, reliable, clear, stable with tough loads and stable with crappy AC line voltages that might be found at a music venue.

The XLS 2000/2 has a surprisingly powerful low end, very wide soundstage extending 3’ beyond the speakers (but not very deep), decent midrange and top end. The Crown is silent with a black background and relatively musical overall.

A couple of great and really appreciated features include “no speaker thump” turn on and gain controls located on the front of the amp. The gain controls are fantastic when you have 98db efficiency speakers like the Lores. With no gain controls, you often only have the preamp/DAC at the 8-9 o’clock position and the loudspeakers are screaming…but if you also have a subwoofer that is connected to the preamp, you likely have to turn the sub gain controls all the way up which can sometimes compromise the sound. With the Crown XLS2000 you set the amp gain down allowing you to set the preamp volume up and your sub will sound its best. (You can also use the gain controls to equalize the left right volume if need be without the degradation you can sometimes get from balance controls).

This amp is insanely powerful…1050 watts into 2ohms per channel, 375 watts into 8 ohms and 650 watts into 4 ohms…bridgeable to mono with over 2000 watts. The input voltage required to drive to full output is 1.4 volts so it can pretty easily be driven directly by most CD players and DACs without a preamp.

On several occasions I emailed Crown with questions and always received a prompt reply that was helpful.

My overall feeling is that this is a really good starter amp for someone on a budget, for a second system, for a college kid, etc. Pretty good sound, bullet proof, tons of power, lots of connections, and all the connections needed for double duty use in dj applications and other pro audio type gigs as well as home audio…and less than $500.


Nuprime STA9

The amp is beautifully packaged and this by itself gives you a certain level of confidence as you open the box. In most (but not all) areas, the STA9 is a step up from the Crown. Although the soundstage presented is not as wide, it is deeper and more dimensional. Although the bass is not as powerful, it is more tuneful (better pitch). The midrange and top end have better definition with slightly better instrument separation. Head to head, the Nuprime sounds  more musical.

Both the Crown and the Nuprime are class D and weigh about 10lbs…but the Nuprime is about half the overall size. Nuprime says it designed this amp with a Class A input favoring 2nd order harmonics. This may explain why the Nuprime idled at 103 degrees and ran at 107 degrees while the Crown remained at room temperature and the fan never kicked on.  Like the Crown, the Nuprime is also dead silent and has a very black background.

A couple things I didn’t appreciate so much about the Nuprime: the on/off switch is on the back, it frequently thumped my loudspeakers when turning on and of (as well as when the oppo or the preamp turned on and off) and it didn’t have gain controls which made it much more difficult to integrate with the subwoofer.

The Nuprime is rated at 120 watts into both 4 ohms and 8 ohms and bridgeable to 290 watts mono.

Like with Crown, my email correspondence with Nuprime was always answered in a timely manner.

Based on sound alone, this amp is worth a try. You may not experience some of the things that bothered me…or they may not bother you.   If you don’t need the power of the Crown and you have a little more money to spend, this might be a good choice.

 

Parasound Halo A23

The Halo was also beautifully packaged (double boxed) with a very clearly written manual included. Parasound describes this amp as high bias Class A/AB…meaning that for the first watt or two, it operates as class A and then operates as A/B as more watts are used. (Pass labs has a very nice description of what actually happens http://www.firstwatt.com/pdf/art_leave_classa.pdf    )  I can’t say that I actually noticed any difference or if there was actually a change from Class A to A/B but I can say that in my system in my room, the Halo sound was a pretty big step up from the Nuprime (which was a step up from the Crown). The soundstage can best be described as immersive (deep and wide) with a strong, detailed low end, detailed and silky mids and highs with good instrument separation and very musically engaging.

Like the Crown and Nuprime, the Halo has a black background with no speaker hiss whatsoever. The Halo has a very effective relay that never thumped my loudspeakers. The operating temperature remained under 90 degrees for the first hour and then gradually climbed to 105 degrees by the third hour so ventilation may be needed. The Halo has gain controls on the rear and the on/off switch is on the front.

The Halo is rated at 125 watts into 8 ohms, 225 watts into 4 ohms, is bridgeable and will drive 2 ohm loads but not at full power at 20hz. Email response from Parasound was also quick.

If you can afford $1000 (new) or $700 (preowned), this is the best sounding amp of the group and deserves strong consideration. Another point worth mentioning is resale; Parasound has a good reputation and their products seem to resell pretty quickly on Audigon with prices that hold up pretty well over time.


Final Thoughts

Until you have a chance to try a piece of equipment in your home in your system in your room, you can only speculate as to what it will sound like and what quirks will drive you crazy. No matter how good the reviews and forum comments are its definitely worth the price of return shipping to try equipment for a few weeks before deciding.


snapsc
auxinput
2,920 posts
 

My experience with Class D amps is that they may be very good at control and very clean (although the older Class D circuits typically were driven by the speakers impedance curve, which could result in things like weak bass/midbass and rolled off highs).  However, I found Class D amps lacking in something – they were very clean but they just did not “sing” and lacked that emotional engagement.  I think this is primarily due to the inability to respond fast enough to the higher frequencies (which causes Class D to typically lack “air”).  I believe that the on/off switching method in Class D transistor just cannot respond fast enough to the higher frequencies to properly give it good sound quality.

That being said, I think the Crown XLS could be a very good subwoofer amp.  The Nuprime might be interesting with its tube like sound and Class A input stage.  But I’m not sure that either one will “sing” like the Parasound A23.  Though, if you have a low impedance speaker (such as a pure 4 ohm or with woofers that drop down to 3-4 ohms), the Parasound may not have the bass/sub-bass response.  If you have this situation, maybe look into the Parasound 2250v2, which has a much larger power supply, but maybe not quite the "Halo" level sound quality.  I think 2250 is still very good, though.

The Odyssey amps mentioned here are also excellent.  I think they have very excellent resolution and sound quality.  However, Klaus likes to use smaller transformers (400VA for all his amps).  The more expensive Stratos has an option for dual transformers (2 x 400VA), but they are still on the small side.  Other options include increased capacitor bank, which is excellent.  I think the end result will be very tight bass, but not the full sub-bass experience that a larger transformer would give you.  The Parasound 2250 will likely have more brute force for a deeper sub-bass response, but it will not have the resolution of the Odyssey.  Even the Parasound A23 with its 1000VA transformer may be better.

loomisjohnson
1,943 posts
 
fwiw, i picked up the sherwood 4105 receiver touted by michaelgreen ($19.99 on ebay) and it is a good sounding piece--impressively transparent, with good low end control and little of the brittle "digital" quality of typical low end ss gear.
auriian
23 posts
 
any schematics available to swap out parts , replace some caps with poly if they fit? how many opamps are in the thing? crappy electrolytics caps in a signal path? replace any cheap ’aluminum’ or other crappy wire in the signal path, crap binding posts? the entire chassis looks like it could use some sound damening or some kind of anti vibration mat stuck to some of the solid areas that are not vented. rubber grommet the power tranny unlkess it need to be grounded..  lets do some mr green tweaks and hear it...
snapsc OP
674 posts
 
One of the "intents" of this thread was to reinforce an idea that is woven throughout hundreds of forum threads/comments:  that you can enter/enjoy this hobby without spending a fortune...that "budget" equipment can sound pretty darn good....and that there are enough differences in sound to make it worth a person investigating what might suit them the best.

My hope was that people would add their own experiences with these three amps...and put forward additional budget amps/receivers that they think also sound good at a budget price and therefore worth discussing and considering....in other words, more points of entry or possible upgrades for consideration.

As for budget tweaks to budget new or preowned equipment, I suspect that it is unlikely that new people entering the hobby will want to go this route and more likely that they will want to just straight up buy a budget product that has been well reviewed....maybe a new thread is in order; "budget tweaks resulting in better sounding budget equipment".
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